sql - HANA: Split string?

Sql - HANA: Split string?

In SAP HANA, you can split a string into multiple parts using several methods, depending on your specific requirements and the version of SAP HANA you are using. Here are two common approaches:

Approach 1: Using SUBSTRING and POSITION Functions

You can use the SUBSTRING function in conjunction with the POSITION function to split a string based on a delimiter.

Example

Assume you have a string 'apple,banana,orange' and you want to split it into separate values based on the comma (,):

SELECT SUBSTRING('apple,banana,orange', 1, POSITION(',' IN 'apple,banana,orange') - 1) AS Part1, SUBSTRING('apple,banana,orange', POSITION(',' IN 'apple,banana,orange') + 1, LENGTH('apple,banana,orange')) AS Part2 FROM DUMMY;

Explanation

  • POSITION(',' IN 'apple,banana,orange'): Finds the position of the first occurrence of ',' in the string 'apple,banana,orange'.
  • SUBSTRING(string, start, length): Extracts a substring from string starting at start with a length of length.

This example splits the string 'apple,banana,orange' into two parts based on the comma (,).

Approach 2: Using STRING_SPLIT Function (SAP HANA 2.00 and higher)

If you are using SAP HANA 2.00 or higher, you can use the STRING_SPLIT function to split a string into rows based on a delimiter.

Example

SELECT VALUE AS Part FROM STRING_SPLIT('apple,banana,orange', ',');

Explanation

  • STRING_SPLIT(string, delimiter): Splits the string into rows based on the delimiter and returns each part as a separate row in the result set.

This approach simplifies splitting a string into multiple parts and is more versatile for scenarios where the number of parts or the delimiter may vary.

Notes:

  • Adjust the delimiter (',' in these examples) and the string ('apple,banana,orange') according to your specific data.
  • The STRING_SPLIT function is available in SAP HANA 2.00 SPS 03 and higher versions. For earlier versions, you may need to use the SUBSTRING and POSITION approach or implement a custom function.

Choose the appropriate method based on your SAP HANA version and requirements to efficiently split strings as needed in your SQL queries.

Examples

  1. How to split a comma-separated string in HANA SQL?

    Description: This query is about splitting a comma-separated string into multiple rows.

    Code:

    SELECT VALUE FROM STRING_SPLIT('apple,banana,grape', ',');

  2. How to split a string by delimiter in SAP HANA?

    Description: This query shows how to split a string by a specific delimiter and return it as separate rows.

    Code:

    SELECT VALUE FROM STRING_SPLIT('part1|part2|part3', '|');

  3. How to split a string into multiple columns in SAP HANA?

    Description: This query demonstrates splitting a string into multiple columns based on a delimiter.

    Code:

    SELECT SUBSTRING_INDEX(SUBSTRING_INDEX('apple,banana,grape', ',', 1), ',', -1) AS part1, SUBSTRING_INDEX(SUBSTRING_INDEX('apple,banana,grape', ',', 2), ',', -1) AS part2, SUBSTRING_INDEX(SUBSTRING_INDEX('apple,banana,grape', ',', 3), ',', -1) AS part3;

  4. How to create a table function to split string in HANA?

    Description: This query involves creating a table function to handle string splitting.

    Code:

    CREATE FUNCTION SPLIT_STRING (input NVARCHAR(5000), delimiter NVARCHAR(10)) RETURNS TABLE (value NVARCHAR(500)) AS BEGIN RETURN SELECT VALUE FROM STRING_SPLIT(input, delimiter); END;

  5. How to use a recursive CTE to split a string in HANA?

    Description: This query uses a recursive common table expression (CTE) to split a string by a delimiter.

    Code:

    WITH RECURSIVE SplitCTE AS ( SELECT SUBSTRING_INDEX('part1,part2,part3', ',', 1) AS part, SUBSTRING_INDEX('part1,part2,part3', ',', -1) AS rest, 1 AS level FROM DUMMY UNION ALL SELECT SUBSTRING_INDEX(rest, ',', 1) AS part, SUBSTRING_INDEX(rest, ',', -1) AS rest, level + 1 FROM SplitCTE WHERE CHARINDEX(',', rest) > 0 ) SELECT part FROM SplitCTE;

  6. How to split a string and insert results into a table in HANA?

    Description: This query demonstrates splitting a string and inserting the results into another table.

    Code:

    INSERT INTO target_table (column_name) SELECT VALUE FROM STRING_SPLIT('apple,banana,grape', ',');

  7. How to handle splitting strings with multiple delimiters in HANA?

    Description: This query shows how to split a string with multiple delimiters.

    Code:

    SELECT VALUE FROM STRING_SPLIT(REPLACE(REPLACE('a,b;c:d', ',', ';'), ':', ';'), ';');

  8. How to split a string and count the number of segments in HANA?

    Description: This query splits a string and counts the number of resulting segments.

    Code:

    SELECT COUNT(*) FROM STRING_SPLIT('apple,banana,grape', ',');

  9. How to split a string into fixed-length substrings in HANA?

    Description: This query splits a string into fixed-length substrings.

    Code:

    SELECT SUBSTRING('abcdef', 1, 2) AS part1, SUBSTRING('abcdef', 3, 2) AS part2, SUBSTRING('abcdef', 5, 2) AS part3;

  10. How to split a string and preserve empty values in HANA?

    Description: This query shows how to split a string and keep empty values between delimiters.

    Code:

    SELECT VALUE FROM STRING_SPLIT('a,,b,c', ',');

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